PT-symmetry-protected Dirac states in strain-induced hidden MoS2 monolayer

Meiling Xu, Guohui Zhan, Siyu Liu, Dongqin Zhang, Xin Zhong, Ziyang Qu, Yinwei Li, Aijun Du, Haijun Zhang, and Yanchao Wang
Phys. Rev. B 100, 235435 – Published 19 December 2019
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Abstract

Two-dimensional (2D) materials have recently attracted significant interest in condensed-matter physics and materials science due to rich intriguing physics and potential applications. Here, by first-principles calculations, we discover a phase of transition-metal dichalcogenides (MoS2 and its family) named the 1H phase. We demonstrate that 1HMoS2 monolayer has multiple topological phase transitions from a topologically trivial insulator state to a 2D type-II Dirac semimetal state, and then to a 2D ideal type-I semimetal state under a moderate tensile strain. The Dirac points are protected by the coexistence of space-inversion (P) and time-reversal (T) symmetry. Our results highlight a family of nonhoneycomb 2D Dirac semimetals with potential application in nanoelectronics.

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  • Received 31 October 2019

DOI:https://doi.org/10.1103/PhysRevB.100.235435

©2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Meiling Xu1,2, Guohui Zhan3,4, Siyu Liu2, Dongqin Zhang5, Xin Zhong6, Ziyang Qu1, Yinwei Li1,*, Aijun Du7, Haijun Zhang3,4,†, and Yanchao Wang2,‡

  • 1Laboratory of Quantum Materials Design and Application, School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou 221116, China
  • 2State Key Laboratory of Superhard Materials & Innovation Center for Computational Physics Methods and Software, College of Physics, Jilin University, Changchun 130012, China
  • 3National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing 210093, China
  • 4Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
  • 5Department of Physics, China Jiliang University, Hangzhou, Zhejiang 310018, People's Republic of China
  • 6Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Changchun 130103, China
  • 7School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, Gardens Point Campus, Brisbane QLD 4001, Australia

  • *Author to whom all correspondence should be addressed. yinwei_li@jsnu.edu.cn
  • zhanghj@nju.edu.cn
  • wyc@calypso.cn

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Issue

Vol. 100, Iss. 23 — 15 December 2019

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